PDF Merger
Combine multiple PDF files into one document.
Drop PDF files here or click to upload — drag to reorder
Merge PDF files in your browser — no upload required
Combining multiple PDFs into one document is one of the most common office tasks — but most online tools upload your files to a remote server, charge after a few uses, or require an account. This free PDF merger runs entirely in your browser using pdf-lib. Your documents never leave your device, which makes it safe for confidential contracts, tax documents, medical records, or any PDF containing private information.
How to merge PDFs step by step
Upload two or more PDF files using the file picker or drag-and-drop zone. Once uploaded, drag the files into the order you want — the final merged PDF will follow this exact sequence. Click Merge and the tool combines the documents client-side in seconds. Download the result as a single PDF. There is no limit on the number of files you can merge; very large PDFs (over 100 MB each) may take longer depending on your device's speed.
Are bookmarks and links preserved?
Internal hyperlinks and annotations within each individual PDF are preserved in the merged output. Cross-document bookmarks — links from one PDF that reference pages in another — are not automatically rewritten, since the target page numbers shift when files are combined. If your workflow depends on cross-document links, update them manually in a PDF editor after merging. Table-of-contents bookmarks from the original files are retained but may point to unexpected page numbers in the merged document.
Merging password-protected PDFs
PDFs protected with an owner password (which restricts printing or editing) can usually be loaded and merged without any special steps. PDFs protected with a user password require you to enter the password before the browser can read the file — the tool will prompt you if it detects encryption. If a file is fully locked with unknown credentials, you will need to unlock it in a dedicated PDF editor before merging.
Common use cases
Merge PDF is most often used to combine scanned documents into a single file for submission, assemble multi-chapter reports or thesis documents, consolidate monthly bank or invoice PDFs into a yearly archive, combine cover letter and CV into one attachment for job applications, and join separately exported slides or handouts into one presentation PDF.
Frequently asked questions
- How many PDFs can I merge?
- There is no hard limit on the number of files — you can merge as many PDFs as your device's available memory allows. Very large PDFs over 100 MB each may be slow to process on lower-end devices or mobile phones. Drag and drop your files in any order, then rearrange them using the up and down arrows before generating the merged output.
- Will the merged PDF keep bookmarks and hyperlinks?
- Internal hyperlinks and annotations within each individual PDF are preserved in the merged output. The page order in the merged file matches the order you arrange the files in the tool. However, cross-document bookmarks or a unified table of contents are not automatically generated — the merged PDF will not have a new bookmark panel linking to each original document's first page.
- Can I merge password-protected PDFs?
- The tool can load and merge PDFs that have only an owner password applied (which restricts printing or editing but not viewing). User-password-encrypted PDFs — those that require a password to open — cannot be loaded without first decrypting them. If a PDF prompts for a password when you open it in a reader, you will need to remove the password using another tool before merging.